For individuals with subclinical thyroid conditions, what is the danger posed by continuous, high iodine load from regular kelp intake?

It acts as a stressor that pushes the system into overt dysfunction.

Individuals who already possess underlying or undiagnosed thyroid conditions, such as Graves' disease or Hashimoto's thyroiditis, are especially vulnerable to excessive iodine intake. If the thyroid is operating just sufficiently—a state termed subclinical—the continuous, high iodine exposure derived from regular kelp consumption can serve as a significant stressor. This stress is capable of tipping the delicate balance, forcing the mildly functioning system into overt, noticeable dysfunction where symptoms become apparent and treatment is urgently required. This slow progression is often overlooked until the resulting imbalance manifests strongly.